(Lava Flats isn't a spell.)

When Lava Flats enters the battlefield, you lose 2 life unless you reveal a monocolored card from your hand.

Lava Flats is indestructible. (Destroy effects and lethal damage don't destroy it.)

: Add  or to your mana pool.

Put Lava Flats on top of your library: Add  to your mana pool.